A manufacturer claims the mean life of bulbs made by their company is 3000 hours. We suspect its lesser. A movie recommender system claims the average error in their ...

H₀: μLF - μLM = 0 (no difference in mean agility) Ha: μLF - μLM ≠ 0 (there is a difference in mean agility) Test statistic: t = -2.013 Degrees of freedom: 14.48 (using Welch's approximation due to ...

The p-value depends on the sample size, the test statistic and the spread (usually standard deviation) of the samples. Let’s return to the example above. Our null hypothesis is: “The mean module mark ...

The power, of a hypothesis test is the probability that the null hypothesis is rejected when it is false. Continuing the example and rejecting the null hypothesis when the sample mean is greater than ...

When constructing a confidence interval with the standard normal distribution, these are the most important values that will be needed. where $\mu$ is the true mean ...

Statistical analysis is a vital component of improving workflows in a given project. To make the most of your data analysis, ...

For example, if you want to test whether a new drug lowers blood pressure, the null hypothesis would be that the mean blood pressure of the experimental group is equal to the mean blood pressure ...

and the rejection region for a hypothesis test. Give the form of a rejection region. Perform tests concerning a true population variance. Compute the sampling distributions for the sample mean and ...

You can use both tests in conjunction with one another ... An example of a null hypothesis: The mean annual return of a stock option is 3%. An example of an alternative hypothesis: The mean ...

Researchers examined hemoglobin levels of Austrailian athletes[1]. Hemoglobin is a protein found in red blood cells that transports oxygen throughout the body and athletes who have low hemoglobin ...

A hypothesis is a tentative statement or assumption that can be tested with data. It is usually based on some theoretical or empirical background, and it expresses a relationship between variables ...